题目内容
| 计算(能简算的要简算) (
| (
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考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算加法,再算乘法;
(3)先算减法,再算乘法;
(4)先算乘法,再算减法;
(5)按照从左向右的顺序进行计算;
(6)根据乘法分配律进行简算.
(2)先算加法,再算乘法;
(3)先算减法,再算乘法;
(4)先算乘法,再算减法;
(5)按照从左向右的顺序进行计算;
(6)根据乘法分配律进行简算.
解答:
解:(1)(
-
)×24
=
×24-
×24
=8-3
=5;
(2)(
+
)×
=
×
=
;
(3)
×(
-
)
=
×
=
;
(4)
-
×
=
-
=
;
(5)
×
×
=
×
=
;
(6)
×
+
×
=
×
+
×
=
×(
+
)
=
×
=
.
| 1 |
| 3 |
| 1 |
| 8 |
=
| 1 |
| 3 |
| 1 |
| 8 |
=8-3
=5;
(2)(
| 3 |
| 4 |
| 1 |
| 12 |
| 3 |
| 5 |
=
| 5 |
| 6 |
| 3 |
| 5 |
=
| 1 |
| 2 |
(3)
| 3 |
| 4 |
| 9 |
| 10 |
| 5 |
| 6 |
=
| 3 |
| 4 |
| 1 |
| 15 |
=
| 1 |
| 20 |
(4)
| 7 |
| 16 |
| 4 |
| 15 |
| 9 |
| 16 |
=
| 7 |
| 16 |
| 3 |
| 20 |
=
| 23 |
| 80 |
(5)
| 3 |
| 4 |
| 5 |
| 15 |
| 5 |
| 12 |
=
| 1 |
| 4 |
| 5 |
| 12 |
=
| 5 |
| 48 |
(6)
| 2 |
| 7 |
| 3 |
| 5 |
| 2 |
| 5 |
| 4 |
| 7 |
=
| 2 |
| 7 |
| 3 |
| 5 |
| 4 |
| 5 |
| 2 |
| 7 |
=
| 2 |
| 7 |
| 3 |
| 5 |
| 4 |
| 5 |
=
| 2 |
| 7 |
| 7 |
| 5 |
=
| 2 |
| 5 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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